JP2000182309A - Optical disk reproducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To select constant linear velocity(CLV) reproducing specified at a multiple speed when necessary while constant angular velocity reproducing is adopted as a basis, and to reduce the power consumption. SOLUTION: For an optical disk controller, a CLV octuple speed selection button 23 or a CLV quadruple speed selection button 24 is operated, and CLV control with a specified multiple speed is instructed. Thus, when a low disk reproducing speed range is enough for used application, or during use at midnight necessitating attention paid to noises around, by instructing CLV control with a specified multiple speed based on user's own determination, a disk motor normally rotary-driven at a constant angular velocity is rotary-driven at low speed, and noises and power consumption are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc reproducing apparatus based on constant angular velocity reproduction and capable of selecting a constant linear velocity reproduction designated as a double speed as required.

[0002]

2. Description of the Related Art An optical disk reproducing apparatus 1 shown in FIG. 3 is an apparatus in which an optical head 3 reads a signal from a signal recording surface of an optical disk 2 and reproduces the signal. The signal read by the optical head 3 is firstly a preamplifier. In the RF amplifier 4, R
The signal is divided into an F signal, a tracking error signal, and a focusing error signal, and is supplied to the optical disk controller 5. The optical disk controller 5 receives the input RF signal.
RF signal is sliced by the value obtained by integrating the signal, and the binary EF is obtained.
The signal is converted into an M signal and supplied to an error correction circuit 6, and an attitude control signal based on a tracking error signal and a focusing error signal is supplied to each of the tracking and focusing actuators 8 and 9 via an actuator driver 7. Thus, the optical head 3 receives the tracking servo and the focusing servo, and its reading posture is stably controlled. The EFM signal output from the optical disk controller 5 undergoes error correction processing in an error correction circuit 6 and is transferred to an external host computer (not shown) or the like as reproduction data.

On the other hand, an optical disk controller 5 serving as disk rotation control means extracts a signal of a predetermined data length from the RF signal supplied from the RF amplifier 4 and uses the signal as a synchronization signal to compare a phase with a PLL clock for giving a target speed. After the gain and phase of the comparison error signal are compensated, the signal is supplied to the motor driver 11 as a rotation control signal for the disk motor 10. That is, the synchronization signal extracted from the read signal is a crystal oscillator (not shown).
The optical disk controller 5 supplies a required rotation control signal to the motor driver 11 so that the phase of the reference clock signal is equal to the frequency of the PLL clock obtained by dividing the reference oscillation signal.
The motor driver 11 converts the rotation control signal into a motor drive signal and drives the disk motor 10 to rotate at a required rotation speed. Thus, the optical head 3 and the RF amplifier 4
The optical disk 2 can be rotated at a constant speed irrespective of the load on the disk motor 10 and the disk weight by a phase locked loop (PLL) formed by a closed loop connecting the optical disk controller 5, the motor driver 11, and the disk motor 10.

[0004]

In the conventional optical disk reproducing apparatus 1 described above, a constant angular velocity reproduction (CAV) in which the optical disk 2 is rotationally driven at the same angular velocity irrespective of the reproduction track position, that is, irrespective of the scanning position in the disk radial direction. This is a configuration dedicated to (playback), and playback is performed at 10 × speed on the inner circumference side of the optical disc 2 and at 24 × speed on the outer circumference side. In general, the reproduction speed of the optical disk 2 is defined by how many times the reproduction speed of the audio compact disk. However, the above-mentioned conventional optical disk reproduction device 1 has a configuration that can perform only constant angular velocity reproduction. When the outer peripheral side is reproduced, the rotation speed of the disk motor 10 becomes extremely high, and the noise accompanying the rotation of the optical disk 2 increases accordingly.
In particular, when the optical disk 2 is reproduced at midnight, there is a problem that the disk rotation sound may be unpleasant.

[0005] Even in the same compact disc, since circuits involved in reproduction are different between an audio compact disc and a video compact disc, for example, TOC (Table of Contents) data read from the innermost portion of the optical disc after the disc is mounted. Therefore, there is also known an optical disk reproducing apparatus that determines the type of a disk, shuts off the power of a circuit that is stopped without being involved in reproduction, or lowers the clock frequency of a DSP (digital signal processing circuit) or the like in the reproduction circuit. ing. However, such a device requires a complicated control circuit for discriminating the disk type, cutting off the power supply to the pause circuit, or switching the clock frequency. Therefore, the device configuration is likely to be complicated, and the classification is pre-defined. Since the measures on the device side are fixedly determined according to the disk type, there is a problem that reduction of power consumption cannot be expected except when the target disk is reproduced. Also, in order to reduce power consumption during standby, a device that turns off the power of the servo circuit only during playback standby has been proposed.However, since power consumption is reduced only during playback standby, power consumption as before during playback is reduced. It had problems such as having to be prepared.

[0006] The present invention has solved the above problems,
Based on the constant angular velocity (CAV) reproduction, if necessary, the constant velocity (CLV) reproduction designated by double speed is selected.
It is an object of the present invention to suppress power consumption at the same time.

[0007]

In order to achieve the above object, the present invention relates to an optical disk reproducing apparatus for scanning a signal recording surface of a rotating optical disk to read and reproduce a signal. ,
A disk rotation control unit that normally drives the disk motor to rotate at a constant angular speed, and only when instructed from the outside, drives the disk motor to rotate at a specified constant linear speed, and the rotation control unit that is manually operated from the outside And a manual operation means for instructing the constant linear speed control designated to the double speed.

Further, the present invention is characterized by further comprising power saving means for switching upon receiving the operation of the manual operation means, reducing a power supply voltage applied to a specific load, and suppressing power consumption. It is.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
This will be described with reference to FIG. FIG. 1 is a front view showing an embodiment of the optical disk reproducing apparatus of the present invention, and FIG. 2 is a schematic configuration diagram of a main part of the optical disk reproducing apparatus shown in FIG.

The optical disk reproducing apparatus 21 shown in FIG. 1 is provided with selection buttons 23 and 24 on a front panel of an apparatus housing 22 as manual operation means for allowing a user to selectively set a disk reproducing speed. It is composed. The front panel has a disc tray 2 in the opening near the upper edge.
A headphone jack 26, a headphone volume 27, an eject button 28, and the like are provided along a lower edge portion.
The reference numerals 3 and 24 are disposed substantially at the center of the lower edge portion and adjacent to each other.

The circuit load in the optical disk reproducing device 21 is
As shown in FIG. 2, the + 5V power supply system load 29 such as the RF amplifier 4, the optical disk controller 5, or the error correction circuit 6, the actuator driver 7, the motor driver 1, and the like.
The load 30 is roughly divided into a +12 V power supply system load 30 such as 1 or the like. Both loads are rated at +5 V power supply or +
Although a 12V power supply is required, a + 5V power supply or a + 12V power supply is not strictly required as in low-speed CLV reproduction.
It has been found that operation is not hindered even if the power supply is stepped down by the power supply voltage.

For this reason, in the present embodiment, the selection buttons 23 and 24 are made to function as a CLV 8 × speed selection button and a CLV 4 × speed selection button, and the power saving mode is automatically selected. That is, as shown in FIG. 2, switch switches 23 s and 24 s are provided which are switched in response to the pressing operation of the selection buttons 23 and 24, and the CLV 8 × speed reproduction in the power saving mode or the CLV 4 × speed in the power saving mode is also provided. Playback is optional. Therefore, for example, when the user wants to use with reduced power consumption, or when it is judged that the disc playback speed range of the application to be used is less than or equal to 8 × speed,
Alternatively, when the camera is used at midnight when the noise to the surroundings is noticed, the CLV reproduction in the power saving mode may be selected by voluntary judgment.

By the way, the CLV 8 × speed selection button 23 corresponds to only the changeover switch 23s, and the CLV 4 × speed selection button 24 corresponds to both the changeover switches 23s and 24s. That is, even if the CLV 8 × speed selection button 23 is pushed and operated, only the changeover switch 23s is switched, and the power saving effect extends only to the + 5V power supply system.
When the V4 speed selection button 24 is pressed, the changeover switches 23 and 24 are switched in conjunction with each other, and the power saving effect extends to both the +5 V power supply system and the +12 V power supply system.

As shown in FIG. 2, the changeover switch 23s is connected to the transistors Ta and Tb via the common contact 23c connected to the +5 V DC power supply and the base resistors Ra and Rb.
Switching contacts 23a, 23 connected to the base
b. The transistors Ta and Tb are
The power supply relay 29r for the + 5V power supply system load 29 is switched and operated. When the transistor Ta is turned on, + 5V rated power is supplied to the + 5V power supply system load 29. However, when the transistor Tb is turned on, +
The 4.7 V power saving power supply is supplied to the +5 V power supply system load 29. A diode 29d disposed on a line connecting the power supply relay 29r and the + 5V DC power supply is a step-down means for stepping down a + 5V rated power supply to a + 4.7V power saving power supply. For example, a forward voltage drop of 0.25 to 0 is provided. .3
A Schottky barrier diode of V or the like is used. Note that a branch line branched from a line connecting the switching contact 23b of the changeover switch 23s and the base resistor Rb is:
It is connected to the CLV 8 × speed designation terminal of the optical disk controller 31 as the disk rotation control means.
When the LV 8 × speed designation terminal takes a high level state,
The optical disk controller 31 instructs the motor driver 11 to reproduce the 8x speed CLV.

As shown in FIG. 2, the changeover switch 24s connects the transistors Ua and Ub via the common contact 24c connected to the +5 V DC power supply and the base resistors ra and rb.
Switching contacts 24a, 24 connected to the base
b. The transistors Ua and Ub are
The power supply relay 30r for the + 12V power supply system load 30 is switched and operated. When the transistor Ua is turned on, + 12V rated power is supplied to the + 12V power supply load 30, but when the transistor Ub is turned on, + 11V is supplied. The power-saving power is supplied to the +12 V power supply system load 30. Power supply relay 30r and + 12V
The diode 30d disposed on the line connecting the DC power supply is:
Step-down means for stepping down a + 12V rated power supply to a + 11V power-saving power supply.
A rectifier diode of 1.0 V or the like is used. A branch line branched from a line connecting the switching contact 24b of the changeover switch 24s and the base resistor rb is connected to the CLV quadruple speed designation terminal of the optical disk controller 31, and the CLV quadruple speed designation terminal and the CLV quadruple speed designation described above. When both terminals are in the high level state, the optical disk controller 31 commands the motor driver 11 to perform quadruple speed CLV reproduction.

Here, during normal CAV reproduction in which neither the CLV quadruple speed selection switch 23 nor the CLV 8x speed selection switch 24 is pressed, the common contacts 23c and 24c are connected to the switching contacts 23a and 24a, and the transistor T
a and Ua are conducting. Therefore, the power supply relay 29
r and 30r supply + 5V rated power and + 12V rated power to the loads 29 and 30, respectively. In addition, the optical disk controller 31 also supplies the CLV 8 × speed designation terminal to the CLV4.
Since both the double speed designation terminals are at the low level, the load 2
In the state where the rated power supply voltage is supplied to each of 9 and 30,
Normal CAV reproduction is performed.

Next, when the CLV 8 × speed selection button 23 is pressed,
The common contact 23c of the changeover switch 23s and the changeover contact 23b are connected. As a result, a high-level signal is applied to the CLV 8 × speed designation terminal of the optical disk controller 31, and it is determined that reproduction at CLV 8 × speed has been selected. At the same time, the transistor Tb is turned on, and the power supply relay 29r is switched to the + 4.7V power saving power supply side. As a result, the + 4.7V power-saving power supply voltage stepped down through the diode 29d is supplied to the power supply relay 29r.
Is supplied to the + 5V power supply system load 29 via the. Therefore,
Although the rated power supply voltage is supplied to the load 30, the 8 × -speed CLV regeneration is performed in a state where the power saving power supply voltage is supplied to the load 29.

On the other hand, when the CLV quadruple speed selection button 24 is pressed, the changeover switches 23s and 24s are both switched, and the common contacts 23c and 24c and the changeover contacts 23b and 2 are switched.
4b is connected. As a result, a high-level signal is applied to the CLV 8 × speed designation terminal and the CLV 4 × speed designation terminal of the optical disk controller 31, and it is determined that reproduction at CLV 4 × speed has been selected. At the same time, the transistors Tb and Ub are turned on, and the power supply relays 29r and 30r are turned on.
r switches to the +4.7 V power saving power supply side and the +11 V power saving power supply side, respectively. As a result, the diode 29d,
The + 4.7V power-saving power supply voltage and the + 11V power-saving power supply voltage, which have been respectively stepped down via 30d, are connected to the power supply relay 29.
r and 30r are supplied to the + 5V power supply system load 29 and the + 12V power supply system load 30. Therefore, the quadruple speed CLV regeneration is performed in a state where the power saving power supply voltage is supplied to the loads 29 and 30 respectively.

When returning to normal CAV playback from CLV 4 × speed playback or CLV 8 × speed playback, select button 23
Alternatively, the pressing operation of the switch 24 may be released, and the changeover switch 2
When the common contacts 23c and 24c of the 3s and 24s return to the switching contacts 23a and 24a, normal CAV reproduction is selected.

As described above, the optical disk reproducing device 11
The disk drive 10 for rotating the optical disk 2 is normally rotated at a constant angular velocity, and only when instructed from the outside, the optical disk controller 31 is driven to rotate at a specified constant linear velocity at a specified double speed. By operating the selection button 23 and the CLV quadruple speed selection button 24 to instruct CLV control with double speed designation, when the disk playback speed range of the application to be used is low enough, or notices noise to the surroundings. When using at midnight, C specified by the user at his own discretion
By instructing the LV control, the disk motor 10, which normally rotates and receives the CAV control, can be rotated at a low speed to suppress noise and suppress power consumption, and the CLV control can be designated by a manual operation. For,
It is easy to immediately reflect the user's judgment, and anyone can easily make the determination.

In response to the operation of the selection buttons 23 and 24, the power supply voltage applied to the specific load 29 or 30 is reduced.
Since the power consumption is reduced, the CL specified by double speed
In the V-speed control, reproduction is performed even when the power supply voltage of the RF amplifier 4, the optical disk controller 5, the error correction circuit 6, the actuator driver 7 for the tracking actuator 8 and the focusing actuator 9, the motor driver 11 for the disk motor 10, etc. is dropped. Based on the fact that it does not cause trouble, reasonable power saving can be promoted.

[0022]

As described above, according to the present invention,
A disk motor for rotating the optical disk is normally rotated at a constant angular speed, and only when externally instructed, the disk rotation control means for rotating at a specified predetermined constant linear speed is manually operated from the outside. The manual operation means instructs to perform the isolinear speed control specified by the double speed. Therefore, when the disk playback speed range of the application to be used is low enough, or when it is used at midnight when the surrounding noise is noticed. At times, by instructing the constant linear speed control designated by the double speed by the user's voluntary judgment,
Normally, a disk motor that rotates at a constant angular speed is driven at a low speed to suppress noise and reduce power consumption.Moreover, since the specification of the constant linear speed control is a manual operation, the user's judgment is immediately reflected. It has excellent effects such as being easy and anyone can easily carry out.

Further, the present invention further comprises a power saving means for switching upon receipt of the operation of the manual operation means, reducing a power supply voltage applied to a specific load, and suppressing power consumption. The linear velocity control is based on the fact that even if the power supply voltage of the RF amplifier, optical disk controller, error correction circuit, actuator driver for tracking actuator or focusing actuator, motor driver for disk motor, etc. is dropped, playback will not be hindered. In addition, it is possible to achieve a reasonable power saving.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of an optical disk reproducing apparatus according to the present invention.

FIG. 2 is a schematic configuration diagram of a main part of the optical disc reproducing device shown in FIG.

FIG. 3 is a schematic configuration diagram showing an example of a conventional optical disc reproducing device.

[Explanation of symbols]

Reference Signs List 2 optical disk 3 optical head 4 RF amplifier 6 error correction circuit 7 actuator driver 8 tracking actuator 9 focusing actuator 10 disk motor 11 motor driver 21 optical disk reproducing device 22 device housing 23 CLV 8 × speed selection button (manual operation means) 24 CLV 4 × speed selection Button (manual operation means) 23s, 24s changeover switch 29 + 5V power supply system load 30 + 12V power supply system load 29r, 30r Power supply relay 31 Optical disk controller (disk rotation control means)

Claims (2)

[Claims] 1. An optical disk reproducing apparatus for reading and reproducing signals by scanning a signal recording surface of a rotating optical disk, comprising: a disk motor for driving the optical disk to rotate;
A disk rotation control unit that normally drives the disk motor to rotate at a constant angular speed, and only when instructed from the outside, drives the disk motor to rotate at a specified constant linear speed, and the rotation control unit that is manually operated from the outside An optical disc reproducing apparatus, comprising: manual operation means for instructing a constant speed control designated to a double speed to the optical disc. 2. The power supply device according to claim 1, further comprising a power saving unit that switches in response to an operation of the manual operation unit, reduces a power supply voltage applied to a specific load, and suppresses power consumption. Optical disc playback device.